Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3171933
Keywords
chemical potential; electric admittance; graphene; Green's function methods; nanostructured materials; phonons; surface roughness; thermoelectric power; vacancies (crystal)
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Funding
- NSF
- ONR
- University of Florida High Performance Computing Center.
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0846563] Funding Source: National Science Foundation
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We investigate the thermoelectric properties of graphene nanoribbons (GNRs) by solving atomistic electron and phonon transport equations in the nonequilibrium Green's function formalism. The dependence of thermopower on temperature and chemical potential is compared to that of graphene, which shows the important role of quasi-one-dimensional geometry in determining the thermoelectric properties of a GNR. The edge roughness and lattice vacancy are found to increase the thermopower but decrease the thermoelectric ZT factor because the decrease in the electronic conductance outweighs the decrease in the thermal conductance and the increase in the thermopower.
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